I can't understand why no one has commented yet, so here goes. Firstly i normally prefer the stanzas of a poem to have the same number of lines, but i like the way your stanzas increase by one line each time (as if you add aline as you get more enthusiastic) though your last stanza does not conform. The structure was otherwise good with a good meter throughout the poem. I enjoyed how you used time as a metaphor throughout as well, your love for this person shines from first to last stanza.
Well done

Grant